Expansion shell for machine bolts



Patented May 6, 1941 UNITED STATES PATENT QFFECE EXPANSEGN SHELL FOR MACHINE BOLTS John Fleaca, Cleveland, Ohio Application April 4, 1940, Serial No. 327,823

2 Claims. (C1. 85-2.4)

My invention relates to expansion shells for by the smooth surface 24a of the outer portions machine bolts or the like, the main object of of the hollow cylindrical surface. which is to provide a means whereby any wood- A pair of flexible split sprin binders 26 are work or iron, such as a balcony, grill work or mounted over the halves Illa and Illb of the body the like, may be secured to stone or brick work, i Wi n recesses Ila n the Outer P rip y or any similar surface. of said body halves to hold the halves together.

Another object is to provide a device of simple app lugs 21 p oject outwardly from each but durable construction which operates with half peltien Na d a pp d Sides of d the highest degree of efiiciency. y-

These and other objects and advantages may In Operation, e e n ated Wed e n t I1 is be noted from the following specification and mounted Within the hollow formed y the tWO its accompanying illustrations, in whi h; halves [Ga and Nib of the body H], the inwardly Fig. 1 is a side elevation of the device extapered Outer Surface thereof being ns rted panded withi aw u a t rearwardly of said body, or toward the back Fig. 2 is an end view of t device t t of the aperture 23 when inserted therein.

bolt head r ov d, The assembled expansion bolt being mounted Fig, 3 i ecti l i of 1, within the aperture 23 the iron bracket 29 or Fig. 4 is an elevation of the inner expanding the like is mounted in Place With a bo e 30 wedge nut m mb r, therethrough, registering with the aperture 23. Fig. 5 is a, ection similar t 3 but t The bolt is inserted through the bore in the device not expanded, said iron bracket and is projected within the Fig. 6 is an enlarged ti on lines of hollow cylindrical portion 24a of the elongated Fig, 5. wedge nut I1 and engages the threaded por- Fig. 7 is an elevation of the inner surface of tion o half of t outer expansible body of the 25 Turning the bolt 25 within the elongated wedge device. nut [1 causes the said wedge nut to be drawn Again referring to the illustrations, a body inwardly, the outer tapered surfaces of the wedge It consists, preferably, of two parts or halves, nut pressing outwardly against the n r tapered Illa and lob respectively, each half having a n surfaces of the body halves Illa and lob, causing series of corrugations II and Ila on its outer them to expand uniformly within the flexible surface. spring binders 26 until the corrugations [2 press Each half portion Illa and lb is split or into the walls of the aperture 23 and the bolt slotted at each end toward the middle as indihead 25a is flush against the bracket 29. cated at l2 and I 2 1; s While the quarter This construction prevents any loosening of sections are held together by their metal s gthe expansion bolt when the shell is expanded 32 3 5 5 the halves ma and become more and prevents any possible loosening of the The inner hollow surface of the body halves t3ghff the that 15 secured thereby' la and H112, are tapered at each end l4 and I5 40 1. An expansion Shell for bolts, comprising llespectlvely wlth stmlght connectmg surface segmental shell sections each having an inner 6 therebetween' inclined surface near each end, said surfaces An elongated Wedge nut has an mwm'dly being inclined in the same direction but at t p Outer Surfaee at one end and V diiferent degrees of inclination, and a nut adaptllarly tapered- Outer Surface at the Opposite ed to receive a bolt, within said sections, said e W a S ht cylindrical S e 29 therenut having at each end a tubular extension the between ending in Shoulder 2| at the junction outer surfaces of which are inclined in the same with the tapered end [9. direction but at different degrees of inclination Lugs 22 on opposed sides of the straight cylinand work against the inclined surfaces of the drical surface 20 serve as stops to prevent the shell sections, the said segmental sections being rotation of the Wedge nut ll within the body slotted lengthwise. 10 while said wedge nut is expanding. 2- An expansion shell for b s, c mp ising A threaded portion 24 centrally of the inner segmental shell sections each having an inner hollow cylindrical surface of the elongated wedge inclined surface near each end, said surfaces put I! receives a bolt 25 which is guided therein being inclined in the same direction but at different degrees of inclination, and a nut adapted to receive a bolt, within said sections, said nut having at each end a tubular extension the outer surfaces of which are inclined in the same direction but at different degrees of mclination and work against the inclined surfaces of the shell sections, the said segmental sections being slotted lengthwise and the nut having lugs on opposite sides fitting in spaces between the adjacent edges of the sections.

J OHN FLEACA. 

